Windows 2003 Cluster & WLS

We are configuring a new clustered environment and moving forward with a Windows 2003 Enterprise Edition Microsoft Cluster. I have scoured the web and BEA's forums, but I see no information about what we will need to do to load our application and configure WLS to take advantage of this environment.

We have two machines OS-clustered together that share an external hard drive. I intend to install WLS on both machines and setup a WLS cluster. Does this make sense to you, and has anyone done this before? I'm trying to identify the gotchas prior to stepping into the data center.